我想索引 RGB 圖像中的一些特定像素。我對(duì) Python 比較陌生，所以我已經(jīng)實(shí)現(xiàn)了索引，就像我在 Java/C# 中所做的那樣。這是代碼：# Pane width (height)pane_step, center = 20, 10for i in range(0, field_size * pane_step, pane_step):    for j in range(0, field_size * pane_step, pane_step):        r, g, b, = img[i + center, center + j, :]        if (r, g, b) == (255, 0, 0):            grid[int(i / pane_step)][int(j / pane_step)] = 2        elif (r, g, b) == (0, 128, 0):            grid[int(i / pane_step)][int(j / pane_step)] = 1        elif (r, g, b) == (0, 0, 0):            grid[int(i / pane_step)][int(j / pane_step)] = -1有沒(méi)有更快、更“pythonic”的方法可以給我同樣的結(jié)果？